看看这段代码：
@XmlRootElement
class Course {
private int id;
private String name;
public Course() {}
public Course(int id, String name) {
super();
this.id = id;
this.name = name;
}
@XmlAttribute(name = "id")
public int getId() {
return id;
}
@XmlAttribute(name = "name")
public String getName() {
return name;
}
public void setId(int id) {
this.id = id;
}
public void setName(String name) {
this.name = name;
}
}
class CourseAdapter extends XmlAdapter<Integer, Course>{
@Override
public Course unmarshal(Integer v) throws Exception {
// what to do hereeeeeeeeeeeeeeee????!!!!
// I want the Course with the id = v unmarshalled from
// the same xml I am unmarshalling at the moment
}
@Override
public Integer marshal(Course v) throws Exception {
return v.getId();
}
}
@XmlRootElement
class Offering {
private int id;
private Course course;
private int capacity;
public Offering() {}
public Offering(int id, Course course, int capacity) {
super();
this.id = id;
this.course = course;
this.capacity = capacity;
}
@XmlAttribute(name = "id")
public int getId() {
return id;
}
@XmlJavaTypeAdapter(CourseAdapter.class)
@XmlAttribute(name = "course")
public Course getCourse() {
return course;
}
@XmlAttribute(name = "capacity")
public int getCapacity() {
return capacity;
}
public void setId(int id) {
this.id = id;
}
public void setCourse(Course course) {
this.course = course;
}
public void setCapacity(int capacity) {
this.capacity = capacity;
}
}
@XmlRootElement
class Department {
private String name;
private ArrayList<Course> courses;
private ArrayList<Offering> offerings;
public Department(){}
public Department(String name, ArrayList<Course> courses, ArrayList<Offering> offerings) {
super();
this.name = name;
this.courses = courses;
this.offerings = offerings;
}
@XmlAttribute(name = "name")
public String getName() {
return name;
}
@XmlElement
public ArrayList<Course> getCourses() {
return courses;
}
@XmlElement
public ArrayList<Offering> getOfferings() {
return offerings;
}
public void setName(String name) {
this.name = name;
}
public void setCourses(ArrayList<Course> courses) {
this.courses = courses;
}
public void setOfferings(ArrayList<Offering> offerings) {
this.offerings = offerings;
}
}
我已经整理了我的部门，结果如下：
<?xml version="1.0" encoding="UTF-8" standalone="yes"?>
<department name="ece">
<courses id="1" name="farsi"/>
<courses id="2" name="dini"/>
<courses id="2" name="riazi"/>
<offerings capacity="10" course="1" id="1"/>
<offerings capacity="20" course="2" id="2"/>
</department>
问题是我不知道如何从这个通过 CourseAdapter 的“解组”功能解组的 xml 中使用 id = v 解组课程。